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[A blood speckle reduction method based on temporal-spatial relativity of intravascular ultrasound]
Haiyan Dong1, Huinan Wang, Ling Tao
1College of Automation Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China.
Insights
This study introduces a new method to reduce speckle noise in intravascular ultrasound (IVUS) imaging. The technique improves the clarity of arterial walls, aiding in the diagnosis and treatment of coronary heart disease.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Cardiovascular Diagnostics
Background:
- Intravascular ultrasound (IVUS) is crucial for diagnosing coronary heart disease and guiding interventions.
- High-frequency ultrasound can cause speckle noise, reducing image contrast and hindering accurate lumen and plaque analysis.
Purpose of the Study:
- To develop a novel noise reduction method for IVUS imaging.
- To enhance the differentiation between arterial walls and surrounding tissues by reducing speckle noise.
Main Methods:
- Utilized temporal and spatial variations inherent in IVUS signals.
- Analyzed frequency spectrum differences between blood speckles and arterial wall tissue.
- Introduced a high-frequency to low-frequency energy ratio for speckle identification.
Main Results:
- Successfully reduced speckle noise in IVUS images.
- Significantly increased the contrast between the arterial lumen, wall, and surrounding tissues.
- Demonstrated improved ability for clinicians to differentiate structures.
Conclusions:
- The proposed method effectively mitigates speckle noise in IVUS.
- Enhanced image clarity aids in precise geometrical and physical parameter measurements.
- The technique supports more accurate diagnosis and intervention planning for coronary heart disease.
Abstract:
The superior imaging manner of intravascular ultrasound becomes more and more widely used in the diagnosis of coronary heart disease and intervention therapy. However, as the frequency of ultrasound increases, strong speckled echo signal from blood may significantly decrease the contrast of lumen and arterial wall structure, which may make it difficult for doctor to diferentiate and measure geometrical parameters and physical parameters of lumen and plaque. In this paper a novel noise reduction method is introduced, which utilizes the temporal and spatial information of IUVS, that is blood echo speckles have higher temporal and spatial variation than the arterial wall. When signals transferred into the frequency field, tissue and blood present different frequency spectrum, then a radio of high frequency energy and low frequency energy is introduced to determine speckles or tissue. Result showed that the method can remarkably remove the speckle noise, increase the contrast and help doctor differentiate the arterial wall from the around tissues.
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